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Finding the Fourth Proportional to 1,124.48, 1,685.76 and 972.20

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Solution

The fourth proportional to 1,124.48, 1,685.76 and 972.20 is: 1,457.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.48 : 1,685.76 = 972.20 : x
  2. Step 2: Convert to fraction form
    1,124.48/1,685.76 = 972.20/x
  3. Step 3: Cross multiply
    1,124.48x = 1,685.76 × 972.20
  4. Step 4: Simplify right side
    1,124.48x = 1,638,895.87
  5. Step 5: Solve for x
    x = 1,638,895.87/1,124.48
  6. Step 6: Final answer
    x = 1,457.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.